I have a long term tennis elbow injury which combined with a job that requires lots and lots of writing finding a gel pen that is eco friendly, reasonably priced, and glides across the paper seemed a tall order. I know this may sound a bit 'nerdy' but I've tried lots and lots of different gel pens which were no match for Pentel Energel gel pens. The bonus is that this company now do a refill version of the standard pen at a very competitive price thanks to Amazon and I have been using these now for some time. I find the quality of the refills - they don't blob or smudge and the ink flows evenly without resistance across the paper - consistant and the price hard to beat. I also rate the turnaround time, from order to delivery, the lead time is usually stated to be around 3-4 weeks, but I have found they pop through the letterbox very much quicker than that, so well done Amazon! I really recommend this product and the supplier of course.